diff --git a/.github/workflows/layered-build.yaml b/.github/workflows/layered-build.yaml
index c9d7e89a75..c8717667d7 100644
--- a/.github/workflows/layered-build.yaml
+++ b/.github/workflows/layered-build.yaml
@@ -5,6 +5,8 @@ on:
 jobs:
     build:
         runs-on: ubuntu-latest
+        env:
+          PR_NUMBER: ${{github.event.number}}
         steps:
             - uses: actions/checkout@v2
             - name: Build
diff --git a/.github/workflows/typecheck.yaml b/.github/workflows/typecheck.yaml
index 2e08418cf6..f6ab643958 100644
--- a/.github/workflows/typecheck.yaml
+++ b/.github/workflows/typecheck.yaml
@@ -5,6 +5,8 @@ on:
 jobs:
     build:
         runs-on: ubuntu-latest
+        env:
+          PR_NUMBER: ${{github.event.number}}
         steps:
             - uses: actions/checkout@v2
             - uses: c-hive/gha-yarn-cache@v2